像act的名词形式是action,人物是actor,形容词是active,副词是actively

1.invent 名词:invention,人物:inventor,形容词:inventive,副词:inventivly 2.use 名词:usage,人物:user,形容词:useful / useless,副词:usefully / uselessly3.operate 名词:operation,人物:operator,形容词:operative / operational,副词:operativly4.dream 名词:dreamland / dreaminess,人物:dreamer,形容词:dreamy / dreamless,副词:ly5.live 名词:life,人物:liver,形容词:living /lively,副词:livelily6.play 名词:life,人物:liver,形容词:living /lively,副词:livelily